Distribution of fresh carbon in different particle-size aggregates of different soil type

2018 International Conference on New Energy and Future Energy System

Liu, Z.^1,2,3,4

Shaanxi Provincial Land Engineering Construction Group Co., Ltd, Xi'an

710075, China^1

Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co. Ltd., Xi'an

710075, China^2

Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Land and Resources, Xi'an, 710075, China^3

Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Xi'An, 710075, China^4

关键词: Degradation degree;    Different particle sizes;    Incubation periods;    Soil aggregate fraction;    Soil organic carbon;    Soil organic carbon content;    Stable carbon isotopes;    Water stable aggregates;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/188/1/012019/pdf
DOI  :  10.1088/1755-1315/188/1/012019

来源: IOP

【 摘 要 】

In order to study the effects of application of fresh carbon on distribution in soil aggregate fractions of red soil and lime concretion black soil, the stable carbon isotope (δ13C) technique was used, and explore the dynamic variation and distribution of soil organic carbon(SOC) in soil aggregates during 13C-labelled rice straw decomposition by an indoor incubation experiment. This experiment was put under incubation at 28°C for 120 days, which included two treatments: CK (no straw) and Str (added with 1% straw), all samples were separated into four aggregate-size classes (>2000, 2000∼250, 250∼53, 13C value of organic carbon in different particle-size water-stable aggregates of Str treatment was significantly higher than that of CK treatment, the δ13C value varied greatly both in red soil and lime concretion black soil, but the turnover rate of native SOC was slow and the degradation degree was relatively close. The quantity of new organic carbon supplied by rice straw found in different levels of aggregates followed a same increasing order of 2000∼250 μm 2000 μm)